Attempt to add a test that should fail

Add the same notification twice and it shouldn't retry....
the logic does that currently it seems

Author: whpearson

tests/app/celery/test_tasks.py

@@ -1716,6 +1716,41 @@ def test_save_email_does_not_send_duplicate_and_does_not_put_in_retry_queue(
     assert not retry.called
 
 
+def test_save_email_twice_does_not_send_duplicate_and_does_not_put_in_retry_queue(
+    sample_email_notification, mocker, mock_celery_task
+):
+    json = _notification_json(
+        sample_email_notification.template,
+        sample_email_notification.to,
+        job_id=uuid.uuid4(),
+        row_number=1,
+    )
+    mock_task = mock_celery_task(provider_tasks.deliver_email)
+    retry = mocker.patch("app.celery.tasks.save_email.retry", side_effect=Exception())
+
+    notification_id = sample_email_notification.id
+
+    save_email(
+        sample_email_notification.service_id,
+        notification_id,
+        signing.encode(json),
+    )
+    save_email(
+        sample_email_notification.service_id,
+        notification_id,
+        signing.encode(json),
+    )
+    save_email(
+        sample_email_notification.service_id,
+        notification_id,
+        signing.encode(json),
+    )
+
+    assert Notification.query.count() == 1
+    assert not mock_task.called
+    assert not retry.called
+
+
 def test_save_sms_does_not_send_duplicate_and_does_not_put_in_retry_queue(
     sample_notification, mocker, mock_celery_task
 ):